Schneider Electric MR-VAV-AX Specifications

TAC I/NETTM MR-VAV-AX

Application Specific MicroRegulatorTM

TAC’s MR-VAV-AX Application Specific MicroRegulatorTM has an extensive range ofpre-engineered VAV control sequences, which combined with a fully integrated actuator and airflow transducer, makes it a low “Total Installed Cost” solution for most VAV terminal unit control applications.

02

TAC I/NET MR-VAV-AX

Application Specific MicroRegulator

Features

Product AT A GLANCE

•Fully Integrated Actuator, Airflow Transducer and Controller in a single, low profile package.

•Standalone and Networked Applications

•Extensive VAV Control Sequences:

–Two Stage Heating, Multiple Modes

–Series/Parallel Fan

–Local/Remote Occupancy Override

–Local/Remote Central Plant Heat or Morning Warm-up Control

–Local/Remote Shut Down Override (fire, failure, etc.)

–Indoor Air Quality Airflow Setpoint Override

–Demand Control Setpoint Override

–Minimum and Maximum Airflow Parameters for heating and cooling

•Complete “Out-of-the-Box” Installation, Configuration and Commissioning

–DIP Switch Configuration and Network Addressing with Local/Remote Override

–Completely mount and secure with one box screw and two damper shaft screws

–Travel Limit Settings

–Automatic calibration of Airflow and Temperature Sensors

–Autoconfiguration of Heating Stages

–“Prove It” function for Performance Verification

–Automatic Database Distribution for Networked Configurations

–Default Parameter Values

(continued)

An intelligent I/STATTM interface for independent local control and an interface to a TAC I/NETTM Distributed Control System are standard options.

Operation

The MR-VAV-AX has been designed to minimize the total installation, setup, configuration and commissioning costs typically associated with VAV controllers.

Installation costs have been reduced by integrating the actuator, airflow transducer and controller into a single, low profile, plenum-rated package that can be completely mounted and secured with one box screw and two damper shaft screws.

Setup costs have been reduced by the provision of DIP switches that can be set during

installation and before power is applied. For most applications, default parameters will allow the controller to run immediately from startup based on these switch settings.

The MR-VAV-AX is also supplied with an extensive range of pre-engineered and tested control sequences and therefore, no application programming is required. All configuration parameters are pre-installed with the most typical default values. However, they can be overwritten either by an I/STAT, an M/STAT (a portable I/ STAT) or the Operator Station PC. Heating stage setpoints, proportional bands and delays are automatically calculated and set in the controller based on the controller setup selection.

Commissioning costs have been reduced by the use of several automated processes.

Airflow conversion parameters are automatically calculated once the box duct diameter and the manufacturer’s K-factor are entered. By measuring and entering the low and high airflow values for the box, automatic calibration of the installed airflow transducer is then performed. Automatic calibration of the temperature sensor is also initiated once a measured value is entered into the controller.